Curbing



p 1933- J. R. CAMPBELL CURBING Filed March 15, 1951 Patented Sept. 19, 1933 UNITE PATENT mm:

I 1,927,388 CURBING 1 Claim.

This invention relates to street curbing.

The objects of the invention are to provide a protection and reinforcement for concrete curbing, which will furnish the desired protection at a reasonable cost; which will strengthen and fully reinforce the concrete in which it is set; which will be strong, durable and lasting and which can be produced and installed at low cost.

The novel features by which the foregoing and other desirable objects are attained are set forth in the following specificationz.

The drawing forming part of the specification illustrates some of the practical commercial em.-

bodiments the invention may take, but it will showing reinforcement rods engaged in one of the anchor lugs; Fig. 4 is a cross-sectional detail illustrating a modification.

In Fig. 1, straight and curved curb plates are.

illustrated at 5 and 6 respectively, set at the juncture of the street pavement 7 with the sidewalk material 8.

These curb plates are anchored in place by rearwardly extending lugs on the back of the same and shown here in the form of dovetail keys 9. These wedge-shaped keys are illustrated as projecting from intermediate portions on the back of the web plates with their upper and lower edges 10, 11, spaced inward from the upper and lower edges of the curb plates, so as to leave unbroken portions 12, 13, of concrete extending continuously along in back of the upper and lower portions of the curb plates. The upper faces 10 and rearward faces 14 of the wedge keys are shown as downwardly inclined with respect to the back of the curbrplates to cause the concrete to settle or pack all the more solidlyabout the keys. In addition to the forward taper, it will be noted in Fig. 3, that the keys may also have an upward taper for interlocking them all the more solidly in the surrounding mass.

hn b pbell, Harrison, N.J. i 1 1 Application March 13, 1931.--Serial No.522,19s,.

the concrete through the keys as best indicated at 17, in Fig. 2 and enabling the use of reinforcement or tie rods 18.

Fig. 1 shows how by passing one or more tie rods, bars or wires through the openings in the keys, the adjoining curb plates may be joined together, back of the curb line and within the body of the concrete, to provide a continuous anchorage back in the solid concrete and, as well, a continuous reinforcement for this portion of the concrete which holds the curb plates. The lengths of tie rods or bars or wires may be overlapped or bent or joined together and may be of various suitable sizes and shapes to effect the best reinforcement of the concrete and the most satisfactory anchorage for the curb plates and.

where not really necessary, may be entirely eliminated.

With the holes located in difierent portions of the keys, as indicated in Fig. 2, the location of the reinforcement rods may be selected in accordance with the character of the concrete or other features to effect the best results. Thus,

as indicated, these rods may be located either i in the upper or in the lower portions of the keys and either relatively near to or further back from the body of the curb plates.

By increasing the size and shaping the openings as angular passages as indicated in Fig. 4, the bonding of the concrete through the keys is made more effective.

The key lugs may be located at the ends or at any intermediate points in the length of the curb plates,the arrangement shown in Fig. 1 being suitable for average purposes. Where these keys are cast integral with the curb plates, as in the illustration, suitable fillets may be formed at the junctions of the wedge keys with the backs of the curb plates as illustrated particularly at 19.

The curb plates can, be produced relatively inexpensively in cast iron or other metal, the double wedge-shape of the anchor lugs and the fillet connections with the plates facilitating the drawing operations in molding. Because of the reinforcement and anchorage alforded by the rods or bars, the keys or anchor lugs can be made comparatively thin as indicated in Figs. 1 and 3, keeping down the necessary amount of metal and also enabling the maximum of concrete about the keys. The rods or other reinforcing elements are preferably arranged to exe tend beyond the ends of the plates, continuously behind a number of plates, thus in elfect linking the plates continuously together along a.

dovetail wedge-shaped supporting, reinforcingand anchorage keys projecting from the back of the same and joined with the intermediate portion of the curb plate between the upper'and the lower edges of the latter and having openings therethrough enabling embedding concrete to extend continuously longitudinally in back of said curb plate above and below and through said supporting and anchorage keys, said keys tapering in thickness from the bottom toward the top of the same and also tapering in thickness from the rearward portion toward the front where they are joined with the back of the curb plate, so as to be locked down in the concrete against vertical movement and locked against pulling out laterally away from the concrete and said keying lugs extending downwardly from the lower points of connection with the back of the curb plate to form supports for positioning the curb plate in upright relation ready to receive the embedding concrete and said downwardly extending lower supporting portions of the keys further interlocking the structure in the concrete.

' JOHN ROBERT CAMPBELL. 

